Knob



FIG. 1 is a perspective view of a knob showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof; and,

FIG. 7 is a rear view thereof.

The broken line showing of the open internal side of the knob is for environmental purposes only and forms no part of the claimed design. 

CLAIM The ornamental design for a knob, as shown and described. 